Ikmaaluddin: Shaykh Saduq (r.a.) has narrated from Ibne Mutawakkil from Muhammad Attar from Ibne Isa from Umar bin Abdul Aziz from more than one person from Dawood bin Kathir from Imam Ja’far Sadiq (a.s.) that:

He said with regard to the interpretation of the following verse: “Those who believe in the unseen.” (Surah Baqarah 2:3) “That is regarding those who believe that the uprising of the Qaim [Mahdi] is truth.”